Not to sound discouraging, but although I would anticipate that prices may go down some, I wouldn't expect them to go down a lot.
There has been a lot of discussion on this forum as well as on FlyerTalk and other outlets about the pricing changes everyone has seen. To sum it up, the rental car companies have been more successful in fleet reductions then the airlines. With fleet reductions, there are less vehicles available, which means higher prices for everyone. Another problem is the increasing costs associated with fleets. Manufacturers are more and more reluctant to lease/sell their fleet vehicles at the same levels of discounts as in past years, which means higher costs to the rental agencies, which will be passed onto the renters.
The last, which is outside of the rental car companies control is the increase in taxes and fees and a lot of airport locations. Local governments and airport agencies have found great success in charging travelers for airport upgrades, and recently there was a small increase made at MCO.